With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccvpIcmRtActiveH323CallLegs
Cisco Customer Voice Portal Icm Rt Active H323 Call Legs
1.3.6.1.4.1.9.9.590.1.6.4.1.3
The Intelligent Contact Management (ICM) application has the ability to accept Voice over IP (VoIP)Calls that originate via the Session Initiation Protocol (SIP) or H.323 protocol. The real-time active H323 call legs object is a real-time snapshot metric indicating the current number of calls received by the Intelligent Contact Management (ICM) application via the H.323 protocol.
Back to CISCO-CVP-MIB MIB page.
IPHost Network monitor allows you to monitor ccvpIcmRtActiveH323CallLegs on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.